Sodium sulfide-promoted regiodefined redox condensation of <i>o</i>-nitroanilines with aryl ketones to benzo[<i>a</i>]phenazines and quinoxalines
作者:Duc Long Le、Le Anh Nguyen、Ngoc Binh Vo、Thi Thu Tram Nguyen、Quoc Anh Ngo、Pascal Retailleau、Thanh Binh Nguyen
DOI:10.1039/d3ob02028b
日期:——
was also successfully extended to acetophenones and higherhomologs as reducing partners to provide 2-phenylquinoxalines. Compared to traditional approaches toward benzo[a]phenazine and quinoxaline cores starting with o-phenylenediamines, the present strategy could afford these heterocycles with well-defined regiochemistry based on the structure of starting o-nitroanilines.
廉价的三水合硫化钠被发现可以促进邻硝基苯胺与α-四氢萘酮前所未有的6e-区域预定义氧化还原缩合生成苯并[ a ]吩嗪。该方法还成功扩展到苯乙酮和高级同系物作为还原伙伴,以提供 2-苯基喹喔啉。与从邻苯二胺开始的苯并[ a ]吩嗪和喹喔啉核心的传统方法相比,本策略可以基于起始邻硝基苯胺的结构为这些杂环提供明确的区域化学。
Cu(II)-catalyzed synthesis of quinoxalines from o-phenylenediamines and nitroolefins
An easy and efficient copper-catalyzed reaction for the synthesis of quinoxalines from o-phenylenediamines and nitroolefins is developed. This reaction could proceed well without additional base and be applied to various available substrates with a one-step synthetic procedure in moderate to good yields. (c) 2012 Elsevier Ltd. All rights reserved.